Detachable drill bit

ABSTRACT

The submitted design has same functions and usage as conventional drill heads. It consists of two parts, a solid and a recess truncated cone with 4 sets of troughs and teeth. The two parts are locked together with 4 slotted spring pins. The highly worn drill head can be detached and replaced even with one of different size or different type if needed. Such design feature is thus highly versatile and economical. 
     The design ensures even distribution and absorption of impact force and torque. The integrity of the whole structure while drilling is thus maintained.

1. FIELD OF THE INVENTION

This invention relates to a type of product for boring holes. The toolis indispensable in mining and engineering and is designed to be highlyefficient, time saving and cost effective.

2. BACKGROUND OF THE INVENTION

Commercially available drill heads enjoy numerous varieties anddiversified styles with the sole aim of meeting the need andsatisfaction of the mass clients. A time consuming step in any drillingprocess is the change of drill head. Furthermore, a whole conventionaldrill head currently is replaced after certain period of usage due towear and tear of the inserts. A design that enables rapid exchange andre-use of part of the original drill head could drive down both time andmaterial costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1—this is a structure explanation to the structural parts of thesubmitted design

FIG. 2—this is a crosscut explanation to the inside looking of thestructural parts

FIG. 3—this is overall drawing to display the whole of Detachable DrillBit

FIG. 4—this is to display the Detachable Drill Bit after assembly

3. SUMMARY OF THE INVENTION

To address the aforementioned issues, the present invention adopts atwo-part design such that the highly worn part can be detached andreplaced.

The technical solutions provided in accordance with the presentinvention are as follows: The whole assembly is comprised of Main Bodyand Detachable Head.

(A) Main Body: The splines (FIG. 1-iii) is connected to a percussiondevice/plunger at the back. The front end is an exposed solid truncatedcone with inclination of six degree (6°) (FIG. 1-i). Around the base ofthe cone are 4 troughs. (FIG. 1-ii)

(B) Detachable head: Inserts are placed at the front (FIG. 1-v) and theback portion has a recessed truncated cone with inclination of sixdegree) (6°) (FIG. 2-vi). Around the base of the recessed cone are fourteeth (FIG. 1-vii).

(C) The mating (FIG. 2-C)of the main body and detachable head throughthe solid and recessed truncated cone counters the impact force due todrilling and maintains the integrity of the whole structure. Whereas themating of the four teeth and troughs counters the independent rotationof the two parts caused by the torque while drilling. As a whole, thestructure functions similar to any other conventional drill head.

(D) 4 slotted spring pins (FIG. 2-D) are used to lock both the main bodyand detachable head together through the pre-drilled holes in the 4teeth and in the base with troughs (FIG. 1.-iv)

Drill head assembly:

Main Body:

i. Exposed solid truncated cone with an inclination of six degrees)(6°)

ii. 4 troughs around base of the cone with (iv. Pre-drilled holes forslotted pins)

iii. Splines

iv. 4 sets of pre-drilled holes for slotted spring pins

Detachable head:

v. Inserts

vi. Recessed truncated cone with an inclination of six degrees)(6°)

vii. 4 teeth around base of the cone with (iv. Pre-drilled holes forslotted pins)

viii. Flush

Application:

The whole structure is composed of both main body and detachable head.The two parts are mated through the truncated solid and recessed cone.Independent rotation of the two parts is prevented by the mating of bothteeth and troughs. Finally, the two parts are locked together by 4slotted spring pins.

Given above is a detailed description of a practicable application ofthe drill head of the present invention. It illustrates an example ofapplication rather than setting the scope of the patent protection forthe new drill head. Any similar and equivalent application, alteration,structural dimensions and characteristics not departing from that of thenew drill head shall fall inclusively within the scope of patentprotection for the present invention.

1. I claim a detachable drill bit comprising: main body and detachablehead The main body consists of a solid truncated cone with aninclination of 6°, 4 troughs at the base of the cone, a flat splineconnected to a percussion device/plunger. The detachable head consistsof a recessed truncated cone with an inclination of 6°, inserts and 4teeth at the base of the recessed cone. The mating of the main body anddetachable head through the solid and recessed truncated cone countersthe impact force due to drilling and maintains the integrity of thewhole structure. The mating of the four teeth and troughs counters theindependent rotation of the two parts caused by the torque whiledrilling 4 slotted spring pins are used to lock both the main body anddetachable head together through the pre-drilled holes in the 4 teethand in the base with troughs In accordance with the claims thereof: Thecharacteristics features of the above-mentioned new design drill headare found on its main body and detachable head. The mating of solid andrecessed cone, together with the teeth and troughs results in a drillhead. The two parts are locked together with 4 slotted spring pins. Thisis the way the Detachable Drill Bit set forth in claim is assembled.